Abstract

Craniofacial reconstruction is to estimate a person's face model from the skull. It can be applied in many fields such as forensic medicine, archaeology, and face animation. Craniofacial reconstruction is based on the relationship between the skull and the face to reconstruct the facial appearance from the skull. However, the craniofacial structure is very complex and the relationship is not the same in different craniofacial regions. To better represent the shape changes of the skull and face and make better use of the correlation between different local regions, a new craniofacial reconstruction method based on region fusion strategy is proposed in this paper. This method has the flexibility of finding the nonlinear relationship between skull and face variables and is easy to solve. Firstly, the skull and face are divided into five corresponding local regions; secondly, the five regions of skull and face are mapped to low-dimensional latent space using Gaussian process latent variable model (GP-LVM), and the nonlinear features between skull and face are extracted; then, least square support vector regression (LSSVR) model is trained in latent space to establish the mapping relationship between skull region and face region; finally, perform regional fusion to achieve overall reconstruction. For the unknown skull, first divide the region, then project it into the latent space of the skull region, then use the trained LSSVR model to reconstruct the face of the corresponding region, and finally perform regional fusion to realize the face reconstruction of the unknown skull. The experimental results show that the method is effective. Compared with other regression methods, our method is optimal. In addition, we add attributes such as age and body mass index (BMI) to the mappings to achieve face reconstruction with different attributes.

Highlights

  • The goal of Craniofacial Reconstruction (CFR) [1] is to estimate the facial outlook of an individual according to the skull

  • Craniofacial reconstruction technology is based on the relationship between skull and face in forensic medicine and anthropology to realize the facial reconstruction of an unknown skull

  • This paper proposes a craniofacial reconstruction method based on regional fusion strategy

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Summary

Introduction

The goal of Craniofacial Reconstruction (CFR) [1] is to estimate the facial outlook of an individual according to the skull. Craniofacial reconstruction technology is based on the relationship between skull and face in forensic medicine and anthropology to realize the facial reconstruction of an unknown skull. This technology has been applied in criminal investigation, archaeological anthropology, and other fields. Craniofacial reconstruction includes traditional manual face reconstruction and computer-aided face reconstruction. Traditional manual craniofacial reconstruction method has a long period of facial reconstruction, the results are affected by subjective factors, and the reconstruction personnel needs to have an anatomical and artistic basis. Because the traditional manual method has measurement errors when measuring the thickness of soft tissue by acupuncture or knife method and can only measure the thickness of soft tissue at a few characteristic points, the reconstruction result is inaccurate

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